Add choice prompt handling support

This change adds choice prompt handling support by responding to the new
powerShell/showChoicePrompt message.  When received, the extension will
show a quick pick list with the possible choices.  If the user selects an
option with 'enter' it will be sent for processing.  If the quick pick
gets cancelled either by pressing `ESC` or the UI losing focus, the prompt
will be cancelled in PowerShell.

Author: daviwil

package.json

@@ -29,7 +29,7 @@
         "onLanguage:powershell"
     ],
     "dependencies": {
-        "vscode-languageclient": "0.10.7"
+        "vscode-languageclient": "1.1.2"
     },
     "devDependencies": {
         "vscode": "0.10.6",

src/features/Console.ts

@@ -1,6 +1,5 @@
 import vscode = require('vscode');
-import { LanguageClient } from 'vscode-languageclient';
-import { RequestType, NotificationType, ResponseError } from 'vscode-jsonrpc';
+import { LanguageClient, RequestType, NotificationType } from 'vscode-languageclient';
 
 export namespace EvaluateRequest {
     export const type: RequestType<EvaluateRequestArguments, void, void> =
@@ -21,6 +20,78 @@ export interface OutputNotificationBody {
     output: string;
 }
 
+export namespace ShowChoicePromptNotification {
+    export const type: NotificationType<ShowChoicePromptNotificationBody> =
+        { get method() { return 'powerShell/showChoicePrompt'; } };
+}
+
+interface ChoiceDetails {
+    label: string;
+    helpMessage: string;
+}
+
+interface ShowChoicePromptNotificationBody {
+    caption: string;
+    message: string;
+    choices: ChoiceDetails[];
+    defaultChoice: number;
+}
+
+export namespace CompleteChoicePromptNotification {
+    export const type: NotificationType<CompleteChoicePromptNotificationBody> =
+        { get method() { return 'powerShell/completeChoicePrompt'; } };
+}
+
+interface CompleteChoicePromptNotificationBody {
+    chosenItem: string;
+    promptCancelled: boolean;
+}
+
+function showChoicePrompt(
+    promptDetails: ShowChoicePromptNotificationBody,
+    client: LanguageClient) {
+
+    var quickPickItems =
+        promptDetails.choices.map<vscode.QuickPickItem>(choice => {
+            return {
+                label: choice.label,
+                description: choice.helpMessage
+            }
+        });
+
+    // Shift the default item to the front of the
+    // array so that the user can select it easily
+    if (promptDetails.defaultChoice > -1 &&
+        promptDetails.defaultChoice < promptDetails.choices.length) {
+
+        var defaultChoiceItem = quickPickItems[promptDetails.defaultChoice];
+        quickPickItems.splice(promptDetails.defaultChoice, 1);
+
+        // Add the default choice to the head of the array
+        quickPickItems = [defaultChoiceItem].concat(quickPickItems);
+    }
+
+    vscode.window
+        .showQuickPick(
+        quickPickItems,
+        { placeHolder: promptDetails.caption + " - " + promptDetails.message })
+        .then(chosenItem => onItemSelected(chosenItem, client));
+}
+
+function onItemSelected(chosenItem: vscode.QuickPickItem, client: LanguageClient) {
+    if (chosenItem !== undefined) {
+        client.sendNotification(
+            CompleteChoicePromptNotification.type,
+            { chosenItem: chosenItem.label });
+    }
+    else {
+        // User cancelled the prompt, send the cancellation
+        client.sendNotification(
+            CompleteChoicePromptNotification.type,
+            { promptCancelled: true });
+    }
+}
+
 export function registerConsoleCommands(client: LanguageClient): void {
 
     vscode.commands.registerCommand('PowerShell.RunSelection', () => {
@@ -46,4 +117,8 @@ export function registerConsoleCommands(client: LanguageClient): void {
             consoleChannel.show(vscode.ViewColumn.Three);
         consoleChannel.append(output.output);
     });
+
+    client.onNotification(
+        ShowChoicePromptNotification.type,
+        promptDetails => showChoicePrompt(promptDetails, client));
 }

src/features/ExpandAlias.ts

@@ -1,6 +1,5 @@
 import vscode = require('vscode');
-import { LanguageClient } from 'vscode-languageclient';
-import { RequestType, NotificationType, ResponseError } from 'vscode-jsonrpc';
+import { LanguageClient, RequestType, NotificationType } from 'vscode-languageclient';
 import Window = vscode.window;
 
 export namespace ExpandAliasRequest {

src/features/ShowOnlineHelp.ts

@@ -1,6 +1,5 @@
 import vscode = require('vscode');
-import { LanguageClient } from 'vscode-languageclient';
-import { RequestType, NotificationType, ResponseError } from 'vscode-jsonrpc';
+import { LanguageClient, RequestType, NotificationType } from 'vscode-languageclient';
 
 export namespace ShowOnlineHelpRequest {
     export const type: RequestType<string, void, void> = { get method() { return 'powerShell/showOnlineHelp'; } };

src/main.ts

@@ -7,9 +7,8 @@
 import path = require('path');
 import vscode = require('vscode');
 import settingsManager = require('./settings');
-import { LanguageClient, LanguageClientOptions, Executable } from 'vscode-languageclient';
+import { LanguageClient, LanguageClientOptions, Executable, RequestType, NotificationType } from 'vscode-languageclient';
 
-import { RequestType, NotificationType, ResponseError } from 'vscode-jsonrpc';
 import { registerExpandAliasCommand } from './features/ExpandAlias';
 import { registerShowHelpCommand } from './features/ShowOnlineHelp';
 import { registerOpenInISECommand } from './features/OpenInISE';